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The authors carried out comparative examinations on 30 patients in order to determine whether xeroradiography had any advantages over film techniques in the examination of the soft tissues of the extremities. The xerograms show fatty degeneration of muscle fibres margins of individual muscles, calcification, oedema and so on, more clearly and are therefore of more value in diagnosis. The saving in time, using xerograms, is significant and conventional photo-copies can be obtained without logetronics.

The authors gave a useful sketch of the essence of xeroradiography. Their method has proved to be optimal in demonstrating the soft tissues of the extremities in vivo. The paper provides us with a better cognition of the morphology and pathomorphology of soft tissues of the extremities.

The authors determined the surface absorbed dose (Ds = 67-68 mGy) and the average absorbed dose (Dav = 13-15 mGy) by means of non-screen film radiography of the extremities. The authors recommend the use of xeroradiography (with a tungsten anode tube) or, first of all, a rare-earth screen - film combination (e.g. Kodak min-R + Nuklearmedizin NMB film). The two methods permit the dose values to be decreased by a factor of about 4 and 15, respectively. The dose values are smaller, at least for the 8 cm thick tissue equivalent phantom, when a tungsten anode is used instead of a Mo anode.